Automatically downscales images based on custom presets. Requires 4chan X.
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// ==UserScript==
// @name 4chan Image Resizer
// @namespace https://greasyfork.org/en/users/393416
// @version 2.0.1
// @description Automatically downscales images based on custom presets. Requires 4chan X.
// @author greenronia
// @match *://boards.4chan.org/*
// @match *://boards.4channel.org/*
// @grant none
// @icon https://i.imgur.com/hQp5BTf.png
// ==/UserScript==
//*********************************//
// //
// "it just werks" //
// //
//*********************************//
// //
//----------DEBUG MODE-------------//
var DEBUG = false;//console //
//---------------------------------//
if(DEBUG) console.log("[ImageResizer] Initialized");
//CSS
var style = document.createElement("style");
style.innerHTML = '' +
'.settingsOverlay { background: rgba(0,0,0,0.8); display: none; height: 100%; left: 0; position: fixed; top: 0; width: 100%; z-index: 7; } \n' +
'#imgResizeMenu { position: fixed; top: 20%; left: 50%; width: 620px; margin-left: -15%; padding: 2em; overflow: hidden; }\n' +
'#imgResizeMenu h3 { text-align: center; }\n' +
'#imgResizeMenu a { cursor: pointer; }\n' +
'#imgResizeMenu label { text-decoration-line: underline; }\n' +
'.settingsOverlay input[type=number] { -moz-appearance: textfield; text-align: right; }\n' +
'.resizer-settings { padding-bottom: 5px }\n' +
'#errMsg { color: red; text-align: center; }\n' +
'#ruleTable { border-collapse: collapse; }\n' +
'#ruleTable td, th { padding: 8px; text-align: left; border-bottom: 1pt solid; }\n' +
'#inputContainer { text-align: center; padding-top: 30px; }\n' +
'#inputContainer button { margin-top: 20px; }\n' +
'.menuBtns { margin-left: 1em; }\n' +
'.downscale-menu-off { display: none; }\n' +
'.downscale-menu-on { display: block; }';
var styleRef = document.querySelector("script");
styleRef.parentNode.insertBefore(style, styleRef);
//Load settings
getSettings();
getPresets();
function getSettings() {
if (JSON.parse(localStorage.getItem("downscale-settings"))) {
var settings = JSON.parse(localStorage.getItem("downscale-settings"));
}
else {
settings = { enabled:true, notify:true, convert:false, jpegQuality:0.92 };
}
return settings;
}
function getPresets() {
if (JSON.parse(localStorage.getItem("downscale-presets"))) {
var presets = JSON.parse(localStorage.getItem("downscale-presets"));
}
else {
presets = [];
}
return presets;
}
//Checking if QuickReply dialog is open.
document.addEventListener('QRDialogCreation', function(listenForQRDC) {
var checkBox = document.getElementById("imgResize");
//Checking if the check box already exists
if (!checkBox) {
appendCheckBox();
}
//Listening for clicks on check box
document.getElementById("imgResize").addEventListener("click", checkState);
checkState(1);
if(DEBUG) console.log("[QRFile] Listening...");
//QRFile | Listening for QRFile, in response to: QRGetFile | Request File
document.addEventListener('QRFile', function(GetFile) {
if(DEBUG) console.log("[QRFile] File served: " + GetFile.detail);
const file = GetFile.detail;
//Initialize an instance of a FileReader
const reader = new FileReader();
//console.log("Type: " + file.type);
//Checking if the file is JPG or PNG
if (file.type == "image/jpeg" || file.type == "image/png") {
if(DEBUG) console.log("Acceptable File type: " + file.type);
var presets = getPresets();
if (presets.length > 0 || getSettings().convert) {
reader.onload = function(resize) {
var img = new Image();
img.src = reader.result;
img.onload = function() {
if(DEBUG) console.log("<FILTER START>");
if(DEBUG) console.log("INPUT Dimensions: " + img.width + "x" + img.height);
if(DEBUG) console.log("INPUT File size: " + formatBytes(file.size));
if(DEBUG) console.log(presets);
var matchCount = 0;
var rule = [];
var presetCount = presets.length;
for (var i = 0; i < presetCount; i++) {
//unpack rules
rule[i] = presets[i].split(":");
//check for matching file type
if (rule[i][0] != 0) {
switch (parseInt(rule[i][0])) {
case 1:
rule[i][0] = "image/png";
break;
case 2:
rule[i][0] = "image/jpeg";
}
if (rule[i][0] != file.type) continue;
}
//check for matching dimensions
if (rule[i][1] == img.width && rule[i][2] == img.height) {
var MAX_WIDTH = parseInt(rule[i][3]);
var MAX_HEIGHT = parseInt(rule[i][4]);
matchCount++;
if(DEBUG) console.log("Preset '" + i + "' matched: " + rule[i]);
break;
}
}
//failsafe
if (!getSettings().convert && (matchCount == 0 || matchCount > 1)) {
if(DEBUG) console.log("Image didn't match any presets.\n<END>");
return;
}
//PNG -> JPEG
if (getSettings().convert) {
if(DEBUG) console.log("[Converter] Enabled");
if (file.type == "image/png") {
MAX_WIDTH = img.width;
MAX_HEIGHT = img.height;
if(DEBUG) console.log("[Converter] Converting PNG to JPEG");
}
else if (matchCount == 0 || matchCount > 1) {
if(DEBUG) console.log("[Converter] Image format isn't PNG.\n<END>");
return;
}
}
if(DEBUG) console.log("<FILTER END>");
var canvas = document.createElement("canvas");
var width = img.width;
var height = img.height;
//Calculating dimensions/aspect ratio
if (width > height) {
if (width > MAX_WIDTH) {
height *= MAX_WIDTH / width;
width = MAX_WIDTH;
}
} else {
if (height > MAX_HEIGHT) {
width *= MAX_HEIGHT / height;
height = MAX_HEIGHT;
}
}
// resize the canvas to the new dimensions
canvas.width = width;
canvas.height = height;
// scale & draw the image onto the canvas
var ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0, width, height);
//DEBUG Show image
//document.body.appendChild(canvas);
//Converts dataURI to blob
function dataURItoBlob(dataURI) {
//convert base64/URLEncoded data component to raw binary data held in a string
var byteString;
if (dataURI.split(',')[0].indexOf('base64') >= 0) { byteString = atob(dataURI.split(',')[1]); }
else { byteString = unescape(dataURI.split(',')[1]); }
//separate out the mime component
var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0];
//write the bytes of the string to a typed array
var ia = new Uint8Array(byteString.length);
for (var i = 0; i < byteString.length; i++) {
ia[i] = byteString.charCodeAt(i);
}
return new Blob([ia], {
type: mimeString
});
}
//canvas to dataURL | JPEG quality (0-1)
var dataURL = canvas.toDataURL('image/jpeg', parseFloat(getSettings().jpegQuality));
//dataURL to blob
var blob = dataURItoBlob(dataURL);
//Stop classObserver | prevent trigger loop
classObserver.disconnect();
if(DEBUG) console.log("[classObserver] Stopping...");
//QRSetFile | Set the resized image to upload
var detail = {
file: blob,
name: file.name
};
var event = new CustomEvent('QRSetFile', {
bubbles: true,
detail: detail
});
document.dispatchEvent(event);
if(DEBUG) console.log("[QRSetFile] File Sent");
if(DEBUG) console.log("OUTPUT Dimesnions: " + Math.round(width) + "x" + Math.round(height));
if(DEBUG) console.log("OUTPUT Filesize: " + formatBytes(blob.size));
if(DEBUG) console.log("JPEG Quality: " + getSettings().jpegQuality);
//Notification
var FSInfo = "Original size: (" + formatBytes(file.size) + ", " + img.width + "x" + img.height + ") \n New size: (" + formatBytes(blob.size)+ ", " + Math.round(width) + "x" + Math.round(height) +")";
if (getSettings().notify) {
var msgDetail = {type: 'info', content: FSInfo, lifetime: 5};
var msgEvent = new CustomEvent('CreateNotification', {bubbles: true, detail: msgDetail});
document.dispatchEvent(msgEvent);
}
//Restart classObserver
classObserver.observe(targetNode, observerOptions);
if(DEBUG) console.log("<END> \n[classObserver] Restarting...");
}
}
// Read the file
reader.readAsDataURL(file);
} else {
if(DEBUG) console.log("[Error] Presets not found.\n<END>");
}
} else {
if(DEBUG) console.log("[Error] Invalid FileType: " + file.type + "\n<END>");
}
}, false);
//Observing if a file was uploaded or not | checking if div (with id: "file-n-submit") has class named: "has-file"
function callback(mutationList, observer) {
if (document.getElementById("file-n-submit").classList.contains("has-file") === true && checkState(2) === true) {
if(DEBUG) console.log("<START>\n[classObserver] File detected")
//QRGetFile | Request File
if(DEBUG) console.log("[QRGetFile] Requesting file...");
document.dispatchEvent(new CustomEvent('QRGetFile'));
} else if (checkState(2) === false) {
if(DEBUG) console.log("[classObserver] ImageResizer is disabled");
return;
}
else {
if(DEBUG) console.log("[classObserver] No file");
}
}
//MutationObserver. Checks if div (with id "file-n-submit") has its class attribute changed
const targetNode = document.getElementById("file-n-submit");
var observerOptions = {
attributes: true
};
var classObserver = new MutationObserver(callback);
if(DEBUG) console.log("[classObserver] Starting...");
classObserver.observe(targetNode, observerOptions);
}, false);
//Add a label with a check box for ImageResize in QR, AFTER label with an id "autohide"
function appendCheckBox() {
var label = document.createElement("label");
var input = document.createElement("input");
input.type = "checkbox";
input.id = "imgResize";
input.title = "image-resize";
var reference = document.getElementById("autohide");
reference.parentNode.parentNode.insertBefore(label, parent.nextSibling)
label.appendChild(input);
label.innerHTML += "Resize";
//Checked by default
document.getElementById("imgResize").checked = getSettings().enabled;
}
//Check box state
function checkState(caller) {
var state = document.getElementById("imgResize").checked;
if (state === true) {
if (caller != 2) if(DEBUG) console.log("[ImageResizer] Enabled");
return true;
} else {
if (caller != 2) if(DEBUG) console.log("[ImageResizer] Disabled");
return false;
};
}
//Clears error message <p>
function clearErr() { document.getElementById("errMsg").innerHTML = ""; };
//Checks for any logic errors
function basicCheck(edit, rulePos) {
var inWidth = parseInt(document.getElementById("inWidth").value);
var inHeight = parseInt(document.getElementById("inHeight").value);
var outWidth = parseInt(document.getElementById("outWidth").value);
var outHeight = parseInt(document.getElementById("outHeight").value);
var imgType = parseInt(document.getElementById("imgType").value);
if (outWidth <= 0 || outHeight <= 0) { document.getElementById("errMsg").innerHTML = "Invalid output dimensions"; return}
else if (inWidth < outWidth || inHeight < outHeight) { document.getElementById("errMsg").innerHTML = "Cannot upscale images"; return}
else finalCheck(edit, imgType, inWidth, inHeight, outWidth, outHeight, rulePos);
return;
}
//Checks for any rule overlaps ([0] - Image type, [1] - Input width, [2] - Input height, [3] - Output width, [4] - Output height)
function finalCheck(edit, imgType, inWidth, inHeight, outWidth, outHeight, rulePos) {
var e = document.getElementById("imgType");
var format = e.options[e.selectedIndex].text;
var presetString = imgType + ":" + inWidth + ":" + inHeight + ":" + outWidth + ":" + outHeight;
var presets = getPresets();
if (presets.length > 0) {
var rule = [];
var presetCount = presets.length;
for (var i = 0; i < presetCount; i++) {
if (edit && i === rulePos) continue;
rule[i] = presets[i].split(":");
if (presetString == presets[i]) { document.getElementById("errMsg").innerHTML = "Exact preset already exists"; return }
else if ((inWidth == rule[i][1] && inHeight == rule[i][2]) && (imgType == rule[i][0] || rule[i][0] == 0)) { document.getElementById("errMsg").innerHTML = "Preset with the same input dimensions for " + format + " format already exists"; return }
}
}
//save preset
clearErr();
if (edit) presets[rulePos] = presetString;
else presets.push(presetString);
localStorage.setItem("downscale-presets", JSON.stringify(presets));
//rebuild list
document.getElementById("ruleTable").tBodies.item(0).innerHTML = "";
printList();
//hide / display
document.getElementById("ruleInput").remove();
document.getElementById("addRule").style.display = "block";
return;
}
//Check if possible to calculate output WIDTH
function aspectCheckH() {
var inWidth = document.getElementById("inWidth").value;
var inHeight = document.getElementById("inHeight").value;
var outWidth = document.getElementById("outWidth").value;
var outHeight = document.getElementById("outHeight").value;
if (outHeight > 0) {
if (parseInt(inHeight) >= parseInt(outHeight)) {
calcAspect("width", inWidth, inHeight, outHeight);
clearErr();
}
else {
document.getElementById("errMsg").innerHTML = "Cannot upscale images";
}
}
}
//Check if possible to calculate output HEIGHT
function aspectCheckW() {
var inWidth = document.getElementById("inWidth").value;
var inHeight = document.getElementById("inHeight").value;
var outWidth = document.getElementById("outWidth").value;
var outHeight = document.getElementById("outHeight").value;
if (outWidth > 0) {
if (parseInt(inWidth) >= parseInt(outWidth)) {
calcAspect("height", inWidth, inHeight, outWidth);
clearErr();
}
else {
console.log("bad dimensions/upscaling inHeight" + inWidth + " > outHeight" + outWidth);
document.getElementById("errMsg").innerHTML = "Cannot upscale images";
}
}
}
//Aspect ratio calculation (finds the other output dimension based on given exact input dimensions)
function calcAspect(dimension, w, h, output) {
if (dimension == "width") {
var width = output / h * w;
document.getElementById("outWidth").value = Math.round(width);
}
if (dimension == "height") {
var height = output / w * h;
document.getElementById("outHeight").value = Math.round(height);
}
}
//Print presets list
function printList() {
var presets = getPresets();
var list = document.getElementById("imgResizeList");
var table = document.getElementById("ruleTable");
if (presets.length > 0) {
var rule = [];
var presetCount = presets.length;
for (let i = 0; i < presetCount; i++) {
rule[i] = presets[i].split(":");
switch (parseInt(rule[i][0])) {
case 0:
rule[i][0] = "PNG/JPEG";
break;
case 1:
rule[i][0] = "PNG";
break;
case 2:
rule[i][0] = "JPEG";
}
let delRow = document.createElement("a");
let editRow = document.createElement("a");
delRow.innerHTML = "delete";
editRow.innerHTML = "edit";
//delete a rule and rebuild the list
delRow.onclick = function() {
if (document.getElementById("inputContainer")) document.getElementById("inputContainer").innerHTML = ""; console.log(rule);
presets.splice(delRow.parentElement.parentElement.sectionRowIndex, 1);
localStorage.setItem("downscale-presets", JSON.stringify(presets));
document.getElementById("ruleTable").tBodies.item(0).innerHTML = "";
printList();
clearErr();
document.getElementById("addRule").style.display = "block";
};
editRow.onclick = function() { inputUI(true, rule[i], i); clearErr(); };
var row = table.tBodies.item(0).insertRow(-1);
row.insertCell(0).innerHTML = rule[i][0];
row.insertCell(1).innerHTML = '[ ' + rule[i][1] + ' x ' + rule[i][2] + ' ]';
row.insertCell(2).innerHTML = '→';
row.insertCell(3).innerHTML = '[ ' + rule[i][3] + ' x ' + rule[i][4] + ' ]';
row.insertCell(4).appendChild(editRow);
row.insertCell(5).appendChild(delRow);
}
}
}
function inputUI(edit, rule, rulePos) {
if (document.getElementById("inputContainer")) document.getElementById("inputContainer").innerHTML = "";
document.getElementById("addRule").style.display = "none";
var inputDiv = document.getElementById("inputContainer");
var input = document.createElement("div");
var discardRuleBtn = document.createElement("button");
discardRuleBtn.innerHTML = "Close";
var saveRuleBtn = document.createElement("button");
saveRuleBtn.innerHTML = "Save";
input.id = "ruleInput";
//Rules form
input.innerHTML = '' +
'' +
'<select id="imgType" name="imgType" title="Input Format">' +
'<option value="0">PNG/JPEG</option>' +
'<option value="1">PNG</option>' +
'<option value="2">JPEG</option>' +
'</select> ' +
'' +
'<input type="number" id="inWidth" title="Input Width" size="2" min="0" value="0" onfocus="this.select();"></input> x ' +
'' +
'<input type="number" id="inHeight" title="Input Height" size="2" min="0" value="0" onfocus="this.select();"></input> ' +
'  →   <input type="number" id="outWidth" title="Output Width" size="2" min="0" value="0" onfocus="this.select();"></input> x ' +
'<input type="number" id="outHeight" title="Output Height" size="2" min="0" value="0" onfocus="this.select();"></input><br>';
inputDiv.appendChild(input);
var inWidth = document.getElementById("inWidth");
var inHeight = document.getElementById("inHeight");
var outWidth = document.getElementById("outWidth");
var outHeight = document.getElementById("outHeight");
if (edit) {
switch (rule[0]) {
case "PNG/JPEG":
document.getElementById("imgType").selectedIndex = 0;
break;
case "PNG":
document.getElementById("imgType").selectedIndex = 1;
break;
case "JPEG":
document.getElementById("imgType").selectedIndex = 2;
}
inWidth.value = rule[1];
inHeight.value = rule[2];
outWidth.value = rule[3];
outHeight.value = rule[4];
}
//Listen for user input on target dimension input fields to automatically calculate aspect ratio
outWidth.addEventListener("input", aspectCheckW);
outHeight.addEventListener("input", aspectCheckH);
inWidth.onkeypress = function() {outHeight.value = 0; outWidth.value = 0; return isNumber(event)};
inHeight.onkeypress = function() {outHeight.value = 0; outWidth.value = 0; return isNumber(event) };
outWidth.onkeypress = function() { return isNumber(event) };
outHeight.onkeypress = function() { return isNumber(event) };
input.appendChild(saveRuleBtn);
input.appendChild(discardRuleBtn);
discardRuleBtn.onclick = function(){ document.getElementById(input.id).remove(); document.getElementById("addRule").style.display = "block"; clearErr();};
saveRuleBtn.onclick = function() { if (edit) basicCheck(true, rulePos); else basicCheck(false); };
}
//******************************//
// /!\ very lazy menu ahead /!\ //
//******************************//
function appendSettings() {
//Button--------------------------------------------------------
var span = document.createElement("span");
var button = document.createElement("a");
button.id = "imgResizeSettings";
button.className += "fa fa-cog";
button.style = "cursor: pointer;";
button.title = "Image Resizer Settings";
var ref = document.getElementById('shortcut-settings');
ref.insertBefore(span, parent.nextSibling);
span.appendChild(button);
//Overlay | imgResizeOverlay------------------------------------
var overlay = document.createElement("div");
overlay.id = "imgResizeOverlay";
overlay.classList.add("settingsOverlay");
document.body.appendChild(overlay);
//Settings menu links | imgResizeMenu---------------------------
var menu = document.createElement("div");
menu.id = "imgResizeMenu";
menu.classList.add("dialog");
overlay.appendChild(menu);
var close = document.createElement("a");
close.className += "close fa fa-times";
close.style = "float: right;";
close.title = "Close";
menu.insertAdjacentElement('afterbegin', close);
//Settings
var settingsBtn = document.createElement("a");
settingsBtn.innerHTML += "Settings";
settingsBtn.classList.add("menuBtns");
settingsBtn.style = "font-weight: bold;";
settingsBtn.onclick = function() {
settingsDiv.className = "downscale-menu-on";
presetsDiv.className = "downscale-menu-off";
helpDiv.className = "downscale-menu-off";
settingsBtn.style = "font-weight: bold;";
presetsBtn.style = "";
helpBtn.style = "";
}
menu.appendChild(settingsBtn);
//Presets
var presetsBtn = document.createElement("a");
presetsBtn.innerHTML += "Presets";
presetsBtn.classList.add("menuBtns");
presetsBtn.onclick = function() {
settingsDiv.className = "downscale-menu-off";
presetsDiv.className = "downscale-menu-on";
helpDiv.className = "downscale-menu-off";
settingsBtn.style = "";
presetsBtn.style = "font-weight: bold;";
helpBtn.style = "";
}
menu.appendChild(presetsBtn);
//Help
var helpBtn = document.createElement("a");
helpBtn.innerHTML += "About";
helpBtn.classList.add("menuBtns");
helpBtn.onclick = function() {
settingsDiv.className = "downscale-menu-off";
presetsDiv.className = "downscale-menu-off";
helpDiv.className = "downscale-menu-on";
settingsBtn.style = "";
presetsBtn.style = "";
helpBtn.style = "font-weight: bold;";
}
menu.appendChild(helpBtn);
menu.appendChild(document.createElement("hr"));
//Content divs| imgResizeContent------------------------------------
var content = document.createElement("div");
content.id = "imgResizeContent";
menu.appendChild(content);
content.innerHTML = "";
var errMsg = document.createElement("p");
errMsg.id = "errMsg";
//Settings
var settingsDiv = document.createElement("div");
settingsDiv.id = "settingsDiv";
settingsDiv.classList.add("downscale-menu-on");
content.appendChild(settingsDiv);
//Presets
var presetsDiv = document.createElement("div");
presetsDiv.id = "presetsDiv";
presetsDiv.classList.add("downscale-menu-off");
content.appendChild(presetsDiv);
//Help
var helpDiv = document.createElement("div");
helpDiv.id = "heplDiv";
helpDiv.classList.add("downscale-menu-off");
content.appendChild(helpDiv);
//Enable Resizer------------------------------------------------
//Title
var title = document.createElement("h3");
title.innerHTML = "Image Resizer Settings";
settingsDiv.appendChild(title);
var enableDiv = document.createElement("div");
enableDiv.classList.add("resizer-settings");
enableDiv.innerHTML = '' +
'<input type="checkbox" id="enableSet" title="" size="1"></input>' +
'<label for="enableSet">Enable Resizer</label>: ' +
'Automatically downscales images using given presets.';
settingsDiv.appendChild(enableDiv);
var enableSet = document.getElementById('enableSet');
enableSet.checked = getSettings().enabled;
enableSet.oninput = function() {
var settings = getSettings();
settings.enabled = enableSet.checked;
document.getElementById("imgResize").checked = enableSet.checked;
localStorage.setItem("downscale-settings", JSON.stringify(settings));
}
//Display notifications-----------------------------------------
var notifySetDiv = document.createElement("div");
notifySetDiv.classList.add("resizer-settings");
notifySetDiv.innerHTML = '' +
'<input type="checkbox" id="displaySet" title="" size="1"></input>' +
'<label for="displaySet">Display Notifications</label>: ' +
'Displays a notification when an image is downscaled.';
settingsDiv.appendChild(notifySetDiv);
var notifySet = document.getElementById('displaySet');
notifySet.checked = getSettings().notify;
notifySet.oninput = function() {
var settings = getSettings();
settings.notify = notifySet.checked;
localStorage.setItem("downscale-settings", JSON.stringify(settings));
}
//Convert all PNGs to JPEGs-------------------------------------
var convertSetDiv = document.createElement("div");
convertSetDiv.classList.add("resizer-settings");
convertSetDiv.innerHTML = '' +
'<input type="checkbox" id="convertSet" title="" size="1"></input>' +
'<label for="convertSet">Convert All PNGs</label>: ' +
'Automatically converts all submitted PNGs to JPEGs. Presets apply as normal.';
settingsDiv.appendChild(convertSetDiv);
var convertSet = document.getElementById('convertSet');
convertSet.checked = getSettings().convert;
convertSet.oninput = function() {
var settings = getSettings();
settings.convert = convertSet.checked;
localStorage.setItem("downscale-settings", JSON.stringify(settings));
}
//Set JPEG quality----------------------------------------------
//RegExp ^(0(\.\d{1,2})?|1(\.0+)?)$
//Only one number (0 or 1) before decimal, and up tp 2 numbers after decimal, if there is 0 before decimal (between 0 and 9)
//e.g. 0.92 true, 1.92 false
var qualitySetDiv = document.createElement("div");
qualitySetDiv.classList.add("resizer-settings");
qualitySetDiv.innerHTML = '' +
'<input type="text" id="imgQuality" title="JPEG Quality" size="1"></input>' +
'<label for="imgQuality">JPEG Quality</label>: ' +
'A number between 0 and 1 indicating the output image quality. Recommended 0.92.';
settingsDiv.appendChild(qualitySetDiv);
var inputField = document.getElementById('imgQuality');
inputField.value = getSettings().jpegQuality;
inputField.onkeypress = function() { return isDecimalNumber(event) };
//Check input field validity
inputField.oninput = function() {
var inputField = document.getElementById('imgQuality');
var r = new RegExp(/^(0(\.\d{1,2})?|1(\.0+)?)$/);
if(r.test(document.getElementById('imgQuality').value)) {
inputField.setCustomValidity("");
var settings = getSettings();
settings.jpegQuality = inputField.value;
localStorage.setItem("downscale-settings", JSON.stringify(settings));
}
else inputField.setCustomValidity("Set the value between 1 and 0 up to 2 numbers after the decimal point.");
}
//Preset table | ruleTable----------------------------------------
var table = document.createElement("table");
var thead = document.createElement("thead");
var tbody = document.createElement("tbody");
var presetsTitle = document.createElement("h3");
presetsTitle.innerHTML = "Presets";
presetsDiv.appendChild(presetsTitle);
table.appendChild(thead);
table.appendChild(tbody);
table.id = "ruleTable";
var row = thead.insertRow(0);
row.insertCell(0).outerHTML = "<th>Format</th>";
row.insertCell(1).outerHTML = "<th>Input</th>";
row.insertCell(2).outerHTML = "<th></th>";
row.insertCell(3).outerHTML = "<th>Output</th>";
row.insertCell(4).outerHTML = "<th></th>";
row.insertCell(5).outerHTML = "<th></th>";
presetsDiv.appendChild(table);
//Input container | inputContainer------------------------------
var inputDiv = document.createElement("div");
inputDiv.id = "inputContainer";
presetsDiv.appendChild(inputDiv);
var addRuleBtn = document.createElement("button");
addRuleBtn.id = "addRule";
addRuleBtn.innerHTML = "New Preset";
printList();
presetsDiv.appendChild(addRuleBtn);
presetsDiv.appendChild(errMsg);
button.onclick = function(){ overlay.style.display = "block" };
close.onclick = function(){ overlay.style.display = "none" };
addRuleBtn.onclick = function(){ inputUI(false) };
//Help----------------------------------------------------------
var helpTitle = document.createElement("h3");
helpTitle.innerHTML = "About";
helpDiv.appendChild(helpTitle);
var rant = document.createElement("p");
rant.innerHTML = '<span style="font-weight:bold;">4chan Image <span style="text-decoration-line: line-through;">Resizer</span></span> <s>can\'t upscale</s> automatically downscales images based on custom presets. Originally developed to downscale anime/vidya screenshots "on the fly".<br><br>' +
'To get started, you first have to create a preset by choosing an input image format and entering input and output dimensions (pixels). Then just submit (drag & drop) an image to a quick reply form. ' +
'<br>If it meets any of the presets input requirements, the image will be automatically downscaled to specified dimensions as a <span style="font-weight:bold;">JPEG</span>. ' +
'<br><br><span style="font-weight:bold;">Note</span> that output dimensions are constrained by input dimensions <span style="font-weight:bold;">aspect ratio</span>. ' +
'<br><span style="font-weight:bold;">Also note</span> that <span style="font-weight:bold;">setting JPEG output quality to 1</span> may result in filesizes larger than that of the original image, and should be considered as a placebo. ';
helpDiv.appendChild(rant);
}
appendSettings();
//Bloat
function isDecimalNumber(e){var h=e.which?e.which:e.keyCode;return!(46!=h&&h>31&&(h<48||h>57))}
function isNumber(e){var i=(e=e||window.event).which?e.which:e.keyCode;return!(i>31&&(i<48||i>57))}
function formatBytes(a,b){if(0==a)return"0 Bytes";var c=1024,d=b||2,e=["Bytes","KB","MB","GB","TB","PB","EB","ZB","YB"],f=Math.floor(Math.log(a)/Math.log(c));return parseFloat((a/Math.pow(c,f)).toFixed(d))+" "+e[f]}